If you have him on pine, take him off immediately. It causes seizures in snakes.
If it's not dehydration as mentioned above- is he doing it all the time, or only when you touch him? My male tri twitches pretty impressively when handled, and will go so far as to start having those mating convulsions or whatever you call it, when he is really excited and ready to breed (although how he plans to work me into the picture, I don't know!) It scared me to death the first time he did it. Then Jenea told me what he was up to.
Nanci
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*****
1.0 Classic Corn, 0.1 Lavender, 0.0.1 Cali King, 0.1 Nelson's Milk
1.0 Tricolor Hog, 0.1 Eastern Hog, 1.0 Florida King
0.1 Eastern Box Turtle, 1.0 Florida Box Turtle
0.0.2 Desert Torts, 2.0 Feral Pigeons